Bureau of Economic Analysis
Two years ago, we wrote about BEA reports due to US individuals and entities investing abroad - http://www.derrenjoseph.com/2015/06/whats-form-be-10.html
Note: The above reference link was live on June 2017, but it has since been taken down.
It should be acknowledged that not just US outbound investment but also US inbound investment may be similarly required to report. Do note that this is beyond the scope of tax reporting so you may wish to consult an attorney to seek clarification.